Air leak at petrol injector?

[diesel des]

Ok, so i found a air leak at no 3 injector where it goes into the manifold. I took it out cleaned it and the bore it goes into. Swapped it for no 1 injector and built up again with some rubber grease on the perfect lookin o ring. The leak stayed at no 3 so its not the injector its the thing it goes into. I noticed when it was out that it had a shape like a alan key. Does this "insert" screw out of the intake manifold. I have a ABY maifold someplace so will play with that. Is this common.

Its 034 RS2 = injectors....

[volcano rs]

it does screw out but be carefull it normally gets rounded and becomes difficult to get out

[diesel des]

Ok cheers!

[diesel des]

Got that changed. Was cracked. New one sorted it out. Cheers.